sharemd.net works as a markdown pastebin: paste text, press Share, and get a link. The difference from a plain-text pastebin is that readers see the paste rendered, with headings, tables, task lists and highlighted code, and that every paste is deleted automatically after 15 days.
Pastebins are built for throwaway text: a stack trace for a colleague, notes from a debugging session, a config snippet for a ticket. That text is increasingly written in markdown, either by you or by the AI tool that helped you debug. A plain-text paste shows the ## and | characters as they are; a rendered paste shows the structure they describe.
How to create a paste
- Paste your text into the editor above. Wrap logs and code in fenced blocks with a language tag, such as
```sqlor```bash, to get highlighting. - Press Share.
- Copy the read-only link into the ticket, chat or incident channel.
There is no syntax selector to set. The language is read from each code block’s tag, so one paste can mix SQL, YAML, shell output and prose, as in the example above.
What a paste supports
- Highlighting for JavaScript, TypeScript, Python, HTML/XML, CSS, JSON, SQL, Bash/shell, YAML, Go, Rust, Java and C++. Untagged blocks and other languages, such as raw log lines, stay plain and monospaced.
- Tables, task lists, footnotes and strikethrough around the code.
- Mermaid diagrams and KaTeX math, if your notes need them.
- Pastes up to 500 KB.
- The original text back as a .md file, through Export.
Expiration is the default
A paste lives 15 days from creation. A badge shows how many days are left, and when the time is up the content is deleted and the link returns a page saying the document expired, with HTTP status 410. There is no setting to make a paste permanent, and today there is also no way to delete one early or extend it. For debugging notes and logs, that default means old pastes do not pile up with content that was only relevant for a day. Why expiring documents are a reasonable default is covered in why ephemeral documents.
Pastes are not listed anywhere and not indexed by search engines; they are reachable only through their link. Anyone who has the read link can read the paste, and anyone with the write link can edit it, so scrub tokens, passwords and customer data before pasting.
If you just want the shortest path from clipboard to link, the paste markdown online page describes it. If markdown you paste into Slack shows up as raw symbols, read markdown not rendering in Slack.
Frequently asked questions
How is this different from a regular pastebin?
The paste is rendered as markdown instead of shown as plain text, code blocks are highlighted per block, and every paste is deleted automatically after 15 days.
Can I make a paste that never expires?
No. Every paste expires 15 days after creation.
Are pastes public?
They are not listed and not indexed by search engines. Anyone with the link can open the paste, so treat the link as the access.
Can I paste plain logs without markdown?
Yes. For readable output, wrap the log in a fenced code block so line breaks and spacing are kept.